fix(CoSTEER): rebind RAG cursor when fresh evolving_trace is supplied

[genisis0x]

Summary

• Fixes CoSTEER RAG trace cursor can skip fresh repair feedback #1398. CoSTEERRAGStrategyV2.generate_knowledge keeps a persistent current_generated_trace_count cursor scoped to the strategy instance, but each CoSTEER.develop() run can pass a fresh evolving_trace object. When the stale cursor happened to equal the length of a new trace, the early-return short-circuit fired and the latest repair feedback was never recorded.
• In multi-task CoSTEER repair this surfaces as already-successful candidates from the previous repair step being rescheduled, because their passing implementations were not written into success_task_to_knowledge_dict before the next round of querying.
• Bind the cursor to the identity of the evolving_trace object and reset it whenever a new trace is observed or the cursor is past the end of the current trace (e.g. after truncation). When the same trace object is re-supplied the cursor still short-circuits, so the same knowledge is not re-ingested twice.

Validation

• uv run pytest test/utils/coder/test_costeer_rag_cursor.py — 3 passed
• uv run black --check --diff rdagent/components/coder/CoSTEER/knowledge_management.py test/utils/coder/test_costeer_rag_cursor.py -l 120 — clean
• uv run ruff check rdagent/core --ignore FBT001,FBT002,I001,E501 — clean
• Manual pre-fix sanity check: stashing the patch and running the new test reproduces the bug (test_fresh_trace_with_same_length_is_still_ingested fails with task_beta missing from success_task_to_knowledge_dict); reapplying the patch turns it green.

Tests added

• test_fresh_trace_with_same_length_is_still_ingested -- a fresh trace whose length matches the previous trace's still routes feedback into the knowledge base.
• test_same_trace_object_is_not_reprocessed -- the same trace object short-circuits so identical knowledge is not double-ingested.
• test_cursor_resets_when_trace_truncates_below_cursor -- a stale current_generated_trace_count larger than the current trace is reset to 0 before walking the trace.

Fixes #1398

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📚 Documentation preview 📚: https://RDAgent--1409.org.readthedocs.build/en/1409/

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[genisis0x]

Read the CLA — all clear from my side.

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